Remote phase cntrl

To: tesla-at-pupman-dot-com
Subject: Remote phase cntrl
From: "Jeff W. Parisse" <jparisse-at-teslacoil-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Mon, 27 Mar 2000 06:40:16 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

TCML,

This works great on my 3600 RPM salient pole
sync motor and yes, it's good for about 10-15 degrees
in each direction (20-30 degrees total)! I used Terry's
60Hz Sync Strobe and watched the index change while
I varied the input voltage from 70-140 volts. Wow! What
a handy adjustment and so easy! I can't wait to try this on
a running coil! Thanks Richie!

Jeff Parisse


> BTW. For those wanting to control sync RSG phase remotely, complex phase
> shifting of the line voltage is not necessary if shifts of less than 90deg
> are sufficient.  If the line voltage is merely decreased with a Variac,
> the phase of the motor shaft moves through 90deg before falling out of
> sync.
>
> Therefore a simple variable voltage source (Variac) can provide some phase
> adjustment provided your motor locks-in over a reasonable voltage range.
> Maybe the motor could be set to roughly the desired phase mechanically,
> and a Variac could be used to get +/- 20 degrees or so. Beware trying to
> delay the firing too far,  as it WILL hunt eventually !!!